Start measuring f16 and srgb speed.

src/core/SkBitmap.cpp

Index: src/core/SkBitmap.cpp
diff --git a/src/core/SkBitmap.cpp b/src/core/SkBitmap.cpp
index a803c782274a2690af2bcdfa9f8393e4a1c7c440..e73217ea50f4eab94e16f1baedebc021f87e5f3e 100644
--- a/src/core/SkBitmap.cpp
+++ b/src/core/SkBitmap.cpp
@@ -535,6 +535,9 @@ void* SkBitmap::getAddr(int x, int y) const {
     if (base) {
         base += y * this->rowBytes();
         switch (this->colorType()) {
+            case kRGBA_F16_SkColorType:
+                base += x << 3;
+                break;
             case kRGBA_8888_SkColorType:
             case kBGRA_8888_SkColorType:
                 base += x << 2;